summary.js

'use strict';

const chalk = require('chalk');
const table = require('text-table');

const pluralize = function (word, count) {
  const plural = count === 1 ? word : word + 's';
  return plural;
};

module.exports = function (results) {
  const errorColor = 'red';
  const warningColor = 'yellow';

  let errorCount = 0;
  let fileCount = 0;
  let failureCount = 0;
  let passCount = 0;
  let warningCount = 0;

  results.forEach(function (result) {
    const messages = result.messages;

    if (messages.length === 0) {
      passCount++;
    } else {
      failureCount++;
      warningCount += result.warningCount;
      errorCount += result.errorCount;
    }
  });

  fileCount = passCount + failureCount;

  const summaryLineArray = [
    chalk.bold(fileCount + ' ' + pluralize('file', fileCount) + ' checked.'),
    chalk.bold(passCount + ' passed.'),
    chalk.bold(failureCount + ' failed.')
  ];

  if (warningCount || errorCount) {
    summaryLineArray.push(chalk[warningColor].bold(warningCount + ' ' + pluralize('warning', warningCount) + '.'));
    summaryLineArray.push(chalk[errorColor].bold(errorCount + ' ' + pluralize('error', errorCount) + '.'));
  }

  return '\n' +
            table([summaryLineArray]) +
            '\n';
};